Odell Beckham Jr.﻿will NEVER leave the NY Giants — so says a world-famous porn star … who’s laying her booty on the line for OBJ!

Richelle Ryan — star of XXX hits like “Big Wet Butts” and “Plump Rumps” — is a HUGE Giants fan … so when we got her leaving Vivid’s HQ in L.A., we asked her what to make of the G-Men reportedly trying to deal Odell.

Richelle was triggered — and told us there ain’t a chance she’d let that happen.

“He’s not leaving the Giants … I’ll make sure of that,” Ryan told TMZ Sports. “I will work my magic.”

Richelle also gave us the low-down on her viral “gangbang” pic with UNLV’s baseball team … including whether or not any of the young bucks joined her in the Mile High Club!!